Skip to main content

Table 3 Representative FTIR spectra (cm−1) of dihydrocaffeic acid ester

From: Optimization of enzymatic esterification of dihydrocaffeic acid with hexanol in ionic liquid using response surface methodology

Frequency range (cm−1) Frequency (cm−1) Functional groups
DHCAa Hexyl dihydrocaffeate
3500–3200 3338   3502b, 3386 O–H stretching
3000–2850 2925–2869   2917–2856 C–H stretching
1760–1690 1668   1705 C=O stretching
1600–1400 1525–1441   1608–1534 C=C stretching
1320–1000 1207–1286   1192–1261 C–O stretching
700 ± 20 728 Long chain (C–H)
  1. aDihydrocaffeic acid
  2. bH-bond lattice